Sensor arrangement and method for operation of a sensor arrangement
First Claim
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1. A sensor arrangement, in particular for contactless measurement, comprising:
- a signal generator, which is connected to a first electrode;
a first detector, which is connected to the first electrode, and which is designed to measure a first signal and for a capacitive measurement by means of the first electrode; and
a second detector, which is connected to a second electrode, and which is designed to measure a second signal and to perform a capacitive measurement by means of the first and second electrodes,wherein the first electrode is connected to the first detector and the signal generator by means of a first switch,wherein the signal generator is connected to the second detector by means of a second switch, andwherein the second detector has a further detection amplifier, to which the second signal and a third reference signal can be supplied, and which detection amplifier provides a third detection signal depending on the second signal and the third reference signal.
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Abstract
A sensor arrangement, in particular for a non-contacting measurement, comprises a signal generator (SRC) which is connected to a first electrode (EL1). A first detector (Det1) is connected to the first electrode (EL1), and is designed for a capacitive measurement by means of the first electrode (EL1). A second detector (Det2) is connected to a second electrode (EL2) and is designed to use the first and the second electrodes (EL1, EL2) to carry out a capacitive measurement. A method for operation of the sensor arrangement is likewise specified.
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Citations
14 Claims
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1. A sensor arrangement, in particular for contactless measurement, comprising:
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a signal generator, which is connected to a first electrode; a first detector, which is connected to the first electrode, and which is designed to measure a first signal and for a capacitive measurement by means of the first electrode; and a second detector, which is connected to a second electrode, and which is designed to measure a second signal and to perform a capacitive measurement by means of the first and second electrodes, wherein the first electrode is connected to the first detector and the signal generator by means of a first switch, wherein the signal generator is connected to the second detector by means of a second switch, and wherein the second detector has a further detection amplifier, to which the second signal and a third reference signal can be supplied, and which detection amplifier provides a third detection signal depending on the second signal and the third reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A sensor arrangement, in particular for contactless measurement, comprising:
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a signal generator, which is connected to a first electrode; a first detector, which is connected to the first electrode, and which is designed to measure a first signal and for a capacitive measurement by means of the first electrode; and a second detector, which is connected to a second electrode, and which is designed to measure second signal and to perform a capacitive measurement by means of the first and second electrodes, wherein the first or second detector is/are coupled to a charge measurement apparatus, wherein the charge measurement apparatus provides the first or second signal, and wherein the charge measurement apparatus comprises; a flipflop, which is connected on the input side to a first and a second auxiliary amplifier, wherein a first measurement reference is present at the first auxiliary amplifier and a second measurement reference is present at the second auxiliary amplifier, and the flipflop provides an output signal on the output side, which output signal can be supplied to the first or second detector; and a second measurement switch, which is controllable by means of the output signal in such a way that the second measurement switch connects either a first or second constant current source electrically conductively to inputs of the first and second auxiliary amplifier and couples to the first or second electrode.
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11. A sensor arrangement, in particular for contactless measurement, comprising:
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a signal generator, which is connected to a first electrode; a first detector, which is connected to the first electrode, and which is designed to measure a first signal and for a capacitive measurement by means of the first electrode; and a second detector, which is connected to a second electrode, and which is designed to measure a second signal and to perform a capacitive measurement by means of the first and second electrodes, wherein the first or second detector is/are coupled to a charge measurement apparatus, wherein the charge measurement apparatus provides the first or second signal, wherein the charge measurement apparatus comprises; a flipflop, which is connected on the input side to a first and a second auxiliary amplifier, wherein a first measurement reference is present at the first auxiliary amplifier and a second measurement reference is present at the second auxiliary amplifier, and the flipflop provides an output signal on the output side, which output signal can be supplied to the first or second detector; a second measurement switch, which is controllable by means of the output signal in such a way that the second measurement switch connects either a first or second constant current source electrically conductively to inputs of the first and second auxiliary amplifier and couples to the first or second electrode; a phase-locked loop, to which the output signal and a control reference can be supplied and which provides a closed-loop control signal, which can be supplied to the first or second detector; and first and second adjustable current sources whose respective current intensity can be adjusted by means of the closed-loop control signal.
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12. A method for operating a sensor arrangement, in particular for contactless measurement, comprising:
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providing, by a signal generator connected to a first electrode, a signal current; implementing, by a first detector designed to measure a first signal and connected to the first electrode, a first capacitive measurement by the first electrode with respect to a ground potential; implementing, by a second detector designed to measure a second signal and connected to a second electrode, a second capacitive measurement by the first electrode and the second electrode, wherein the first electrode is connected to the first detector and the signal generator by a first switch, wherein the signal generator is connected to the second detector by a second switch, and wherein the second detector has a further detection amplifier, to which the second signal and a third reference signal can be supplied, and which detection amplifier provides a third detection signal depending on the second signal and the third reference signal. - View Dependent Claims (13, 14)
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Specification